A sludge scraping and suction device and method for a horizontal flow sedimentation tank in a sewage treatment plant

Abstract

The present invention relates to a sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant, comprising a horizontal flow sedimentation tank, a crane, a PLC controller, and an air lift sand suction machine. A scraper frame and a telescopic cylinder are hingedly connected at the bottom of the crane, the piston rod end of the telescopic cylinder is hingedly connected to one side of the scraper frame, a scraper is installed at the bottom of the scraper frame, two sets of ultrasonic sensors with probes pointing vertically downward are also installed at the bottom of the crane, and a calibration ring is installed on the axle of the crane. The beneficial effect is that the thickness of the sludge is judged according to the height difference between the known ultrasonic sensor and the bottom of the horizontal flow sedimentation tank. If the sludge thickness is thick, the number of round trips of the crane in the area is increased, and the operating frequency of the air lift sand suction machine is increased. If the sludge thickness is thin, the number of round trips of the crane in the area is reduced, and the operating frequency of the air lift sand suction machine is reduced, thereby avoiding useless work, improving sludge scraping efficiency, and reducing energy waste.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a device and method for scraping and sucking mud from a horizontal flow sedimentation tank in a sewage treatment plant. Background Art

[0002] As one of the main facilities for removing suspended matter in water, the horizontal flow sedimentation tank consists of four parts: water inlet, water outlet, water flow part and sludge hopper. It has the advantages of simple structure, easy management and strong resistance to impact loads. It has been widely used in the sewage treatment industry.

[0003] However, in the actual operation process, the mud level near the water inlet of the horizontal flow sedimentation tank is generally high and the mud level near the water outlet is low. The on-site operation mode of the mobile scraper and suction machine is generally automatic and non-stop operation on site. The sludge in the area with high mud level cannot be scraped into the sludge hopper, and the scraper in the area with low mud level does useless work, wasting electricity. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant, and also provide a sludge scraping and suction method for a horizontal flow sedimentation tank in a sewage treatment plant.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A mud scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant comprises a horizontal flow sedimentation tank, a crane, a PLC controller, and an air lift sand suction machine. The sand suction pipe of the air lift sand suction machine is connected to the sand collecting hopper of the horizontal flow sedimentation tank. The crane reciprocates along the length direction of the horizontal flow sedimentation tank. The bottom of the crane is hinged with a scraper frame and a telescopic cylinder. The end of the piston rod of the telescopic cylinder is hinged with one side of the scraper frame. The bottom end of the scraper frame is equipped with a scraper. Two sets of ultrasonic sensors with probes pointing vertically downward are also installed at the bottom of the crane. A calibration ring is installed on the wheel axle of the crane. A metal sensor is installed at the bottom of the crane directly above the calibration ring. The sensing end of the metal sensor is facing the calibration ring. The output end of the PLC controller is connected to the crane, the driver of the telescopic cylinder, and the controller of the air lift sand suction machine through cables, and the input end of the PLC controller is connected to the ultrasonic sensor and the metal sensor through cables.

[0007] Furthermore, the calibration ring includes a circular plastic ring and a plurality of sector-shaped aluminum blocks. The outer periphery of the plastic ring is provided with a plurality of sector-shaped aluminum block mounting grooves, and the aluminum blocks are clamped in the aluminum block mounting grooves.

[0008] Furthermore, anti-slip strips are respectively provided on both sides of the aluminum block, and anti-slip grooves are respectively provided on both sides of the aluminum block installation groove, and the anti-slip strips are stuck in the anti-slip grooves.

[0009] Furthermore, a first positioning groove is provided on the inner side of the plastic ring, and a second positioning groove is provided on the wheel axle of the vehicle. A positioning pin is inserted after the first positioning groove and the second positioning groove are aligned.

[0010] Furthermore, the metal sensor is a non-ferrous metal type metal sensor.

[0011] Furthermore, when the scraper frame is in a vertical state, the bottom end of the scraper is close to but not in contact with the bottom end of the horizontal flow sedimentation tank.

[0012] A method for scraping and sucking sludge from a horizontal flow sedimentation tank in a sewage treatment plant uses the above-mentioned sludge scraping and sucking device for the horizontal flow sedimentation tank in the sewage treatment plant, comprising: an ultrasonic sensor emitting an ultrasonic wave toward the sludge, then receiving the ultrasonic wave reflected back by the sludge, and sending the time difference between the ultrasonic wave emission and reception to a PLC controller; the PLC controller calculating, based on the time difference, a height difference H1 between the ultrasonic sensor and the bottom of the horizontal flow sedimentation tank; and, based on a known height difference H0 between the ultrasonic detector and the bottom of the horizontal flow sedimentation tank, calculating the difference between H0 and H1 as the sludge thickness h0; if h0 is greater than a preset value h1, increasing the number of round trips of a vehicle between the area and the sand collecting hopper, and increasing the operating frequency of an air lift sand suction machine; if h0 is less than the preset value h1, allowing the vehicle to pass through the area normally, and reducing the operating frequency of the air lift sand suction machine.

[0013] The beneficial effects of the present invention are as follows: a PLC controller is used to calculate the height difference between the sludge and the ultrasonic sensor according to the ultrasonic reflection time of the received ultrasonic sensor, and the thickness of the sludge is judged according to the known height difference between the ultrasonic sensor and the bottom of the horizontal flow sedimentation tank. If the sludge thickness is thick, the number of round trips of the vehicle in the area is increased, and the operating frequency of the air lift sand suction machine is increased. If the sludge thickness is thin, the number of round trips of the vehicle in the area is reduced, and the operating frequency of the air lift sand suction machine is reduced, thereby avoiding useless work, improving sludge scraping efficiency, and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 is a schematic structural diagram of a device according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1The structural diagram of the enlarged part A in the middle;

[0017] Figure 3 It is a schematic structural diagram of a calibration ring installed on a wheel axle of a vehicle in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0019] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] like Figures 1 to 3 As shown, a mud scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant includes a horizontal flow sedimentation tank 1, a crane 2, a PLC controller 3, and an air lift sand suction machine (not shown in the figure). The sand suction pipe of the air lift sand suction machine is connected to the sand collecting hopper of the horizontal flow sedimentation tank. The crane reciprocates along the length direction of the horizontal flow sedimentation tank. A scraper frame 4 and a telescopic cylinder 5 are hinged at the bottom of the crane 2. The end of the piston rod of the telescopic cylinder 5 is hinged to one side of the scraper frame 4. A scraper 6 is installed at the bottom of the scraper frame 4. Two sets of ultrasonic sensors 7 with probes pointing vertically downward are also installed at the bottom of the crane 2. A calibration ring 8 is installed on the wheel axle of the crane 2. A metal sensor 9 is installed at the bottom of the crane 2 just above the calibration ring 8. The sensing end of the metal sensor 9 is facing the calibration ring 8. The output end of the PLC controller 3 is connected to the crane 2, the driver of the telescopic cylinder 5, and the controller of the air lift sand suction machine through cables, and the input end of the PLC controller 3 is connected to the ultrasonic sensor 7 and the metal sensor 9 through cables.

[0021] The PLC controller is used to calculate the height difference between the sludge and the ultrasonic sensor based on the ultrasonic reflection time of the received ultrasonic sensor. The thickness of the sludge is judged based on the known height difference between the ultrasonic sensor and the bottom of the horizontal flow sedimentation tank. If the sludge thickness is thick, the number of round trips of the vehicle in the area is increased. If the sludge thickness is thin, the number of round trips of the vehicle in the area is reduced to avoid useless work, improve sludge scraping efficiency and reduce energy waste.

[0022] The calibration ring is used in conjunction with the metal sensor to record the number of rotations of the crane's roller, so that the PLC controller can record the running position of the crane, that is, the sludge position.

[0023] The telescopic cylinder is used to drive the scraper blade frame to swing. That is, when scraping is needed, the telescopic cylinder extends to drive the scraper blade to swing downward, and the sludge is scraped into the sludge hopper as the vehicle moves; when scraping is not needed, the telescopic cylinder contracts to drive the scraper blade to swing upward, so that the scraper blade is separated from the sludge, avoiding scraping the sludge away from the sludge hopper.

[0024] The calibration ring 8 includes a circular plastic ring 10 and twelve sector-shaped aluminum blocks 11. The outer periphery of the plastic ring 10 is provided with twelve sector-shaped aluminum block mounting grooves 12. The twelve aluminum block mounting grooves 12 are arranged in a circular array, and the aluminum blocks 11 are stuck in the aluminum block mounting grooves 12.

[0025] Anti-slip strips 13 are respectively provided on both sides of the aluminum block 11 , and anti-slip grooves 14 are respectively provided on both sides of the aluminum block mounting groove 12 , and the anti-slip strips 13 are snapped into the anti-slip grooves 14 .

[0026] A first positioning groove 15 is provided on the inner side of the plastic ring 10 , and a second positioning groove 16 is provided on the wheel axle of the vehicle 2 . A positioning pin 17 is inserted after the first positioning groove 15 and the second positioning groove 16 are aligned.

[0027] The metal sensor 9 is a nonferrous metal type metal sensor. The nonferrous metal type metal sensor records the number of rotations of the roller of the vehicle by detecting the aluminum block on the calibration ring.

[0028] When the scraper frame 4 is in a vertical state, the bottom end of the scraper 6 is close to but not in contact with the bottom end of the horizontal flow sedimentation tank 1. This avoids the scraper 6 from being worn due to friction with the bottom end of the horizontal flow sedimentation tank.

[0029] A method for scraping and sucking sludge from a horizontal flow sedimentation tank in a sewage treatment plant uses the above-mentioned sludge scraping and sucking device for the horizontal flow sedimentation tank in the sewage treatment plant, comprising: an ultrasonic sensor emitting an ultrasonic wave toward the sludge, then receiving the ultrasonic wave reflected back by the sludge, and sending the time difference between the ultrasonic wave emission and reception to a PLC controller; the PLC controller calculating, based on the time difference, a height difference H1 between the ultrasonic sensor and the bottom of the horizontal flow sedimentation tank; and, based on a known height difference H0 between the ultrasonic detector and the bottom of the horizontal flow sedimentation tank, calculating the difference between H0 and H1 as the sludge thickness h0; if h0 is greater than a preset value h1, increasing the number of round trips of a vehicle between the area and the sand collecting hopper, and increasing the operating frequency of an air lift sand suction machine; if h0 is less than the preset value h1, allowing the vehicle to pass through the area normally, and reducing the operating frequency of the air lift sand suction machine.

[0030] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0031] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant, comprising a horizontal flow sedimentation tank, a crane, a PLC controller, and an air lift sand suction machine, wherein the sand suction pipe of the air lift sand suction machine is connected to the sand collecting hopper of the horizontal flow sedimentation tank, and the crane reciprocates along the length of the horizontal flow sedimentation tank, characterized in that: The bottom of the crane is hinged with a scraper frame and a telescopic cylinder, the end of the piston rod of the telescopic cylinder is hinged with one side of the scraper frame, and a scraper is installed at the bottom of the scraper frame. Two sets of ultrasonic sensors with probes pointing vertically downward are also installed at the bottom of the crane, and a calibration ring is installed on the wheel axle of the crane. A metal sensor is installed at the bottom of the crane directly above the calibration ring, and the sensing end of the metal sensor is facing the calibration ring. The calibration ring includes a circular plastic ring and several fan-shaped aluminum blocks. The outer periphery of the plastic ring is provided with several fan-shaped aluminum block mounting grooves, and the aluminum blocks are stuck in the aluminum block mounting grooves; the output end of the PLC controller is connected to the crane, the telescopic cylinder driver, and the controller of the air lift sand suction machine through cables, and the input end of the PLC controller is connected to the ultrasonic sensor and the metal sensor through cables.

2. The sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant according to claim 1, characterized in that: Anti-slip strips are respectively provided on both sides of the aluminum block, and anti-slip grooves are respectively provided on both sides of the aluminum block installation groove, and the anti-slip strips are stuck in the anti-slip grooves.

3. The sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant according to claim 1, characterized in that: A first positioning groove is provided on the inner side of the plastic ring, and a second positioning groove is provided on the wheel axle of the vehicle. A positioning pin is inserted after the first positioning groove and the second positioning groove are aligned.

4. The sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant according to claim 1, characterized in that: The metal sensor is a non-ferrous metal type metal sensor.

5. The sludge scraping and suction device for a horizontal flow sedimentation tank in a sewage treatment plant according to claim 1, characterized in that: When the scraper frame is in a vertical state, the bottom end of the scraper is close to but not in contact with the bottom end of the horizontal flow sedimentation tank.

6. A method for scraping and sucking mud from a horizontal flow sedimentation tank in a sewage treatment plant, using the device for scraping and sucking mud from a horizontal flow sedimentation tank in a sewage treatment plant according to any one of claims 1 to 5, characterized in that: include: The ultrasonic sensor transmits ultrasonic waves to the sludge, then receives the ultrasonic waves reflected back by the sludge, and sends the time difference between ultrasonic emission and reception to the PLC controller. The PLC controller calculates the height difference H1 between the ultrasonic sensor and the bottom of the horizontal flow sedimentation tank based on the time difference. According to the known height difference H0 between the ultrasonic detector and the bottom of the horizontal flow sedimentation tank, the difference between H0 and H1 is calculated to be the thickness h0 of the sludge. If h0 is greater than the preset value h1, the number of round trips between the vehicle and the sand collecting hopper in the area is increased, and the operating frequency of the air lift sand suction machine is increased; if h0 is less than the preset value h1, the vehicle passes through the area normally, and the operating frequency of the air lift sand suction machine is reduced.

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